I have had the car 3 weeks. No codes.

I load the trunk up with about 400lbs or less of bagged Rock for work and ease it down the road back to work.

On the way I get cel

Scanner says po4022


Is that the cat and what can I do for it?

Remove ? Replace?

I can run with out one at least for time being where I live


Before this car ran fine. 99 s70 T5

 

what size magnaflow can I have welded in there? I read on the other forum I can run a high flow magnaflow in place.

is the stock exhaust 2.5 or 3.0 inch ?

 

that code means that the cat isn't doing its job effectively. Sometimes, a bad rear O2 sensor can cause that code, but it usually means the cat is bad. Replacing the cat with something other than a new cat is illegal and certainly won't get the code to go away. Cats are NOT as restrictive as people think they are. Back in the 70s when they were all pellet- bed monstrosities, they were quite restrictive. On a turbocharged car, the ceramic matrix cat used is NOT the major source of backpressure. Yes, it produces some backpressure, but not enough to make much difference. The only reason to put a magnaflow there would be to change the sound of the exhaust. It won't get rid of the code, your exhaust will smell like ***, and you'll risk a big fine if someone finds out. Leave the current one there until you can get it replaced. It won't affect anything- exhaust still flows through it, it's just not cleaning it up as well as it should be.

 

I don't have to have a cat here. Or at least they aren't as strict here

 

How much is a "Volvo" cat?

 

Looks like $220+. I might need one too. Ugh. First I'll replace the front O2 sensor and see how it runs.

 

Where is "here?" If it's in the US, it's a violation of federal law to remove a functioning cat, or to remove a non- functioning one and not replace it with a new one. Fine of up to $25,000 for violation. Now, it's not very LIKELY that anyone will ever know, but most places will ticket you for it, and if your area has any sort of inspection, they WILL notice, and the car will fail. All this aside, there's not much harm in leaving the current cat in place. It's not doing its job as well as it should, but it's working. Getting rid of it= higher emissions. Some folks don't care about that, but some, myself included, do.